<div dir="ltr"><div><div><div><br></div> It doesn't take much (chemical) energy to heat the air enough to go buoyant, there's an old cub scout trick where you hang a tea light candle under a garbage bag (see also <a href="https://youtu.be/N9Ko-yvJzHU">Tailand's festival of lights</a>) and it'll float away for hours. (Before landing in a wooded area and lighting the countryside on fire)<br></div><br> Getting enough heat output from a candle to lift equipment, a camera, fans, rudders, might be challenging. What about a small fuel canister - something like a can of spray lubricant or the tube they use in super-condensed camping stoves? I wonder what kind of energy to weight ratio you could get? Now you've got basically a miniaturized traditional hot air balloon. Think of the places you'll go!<br></div><div> Generating that kind of heat electrically makes me wonder if the lift you produce could ever exceed the weight of the batteries. Maybe if you "warmed it up" from a plugged-in source, then used the batteries to maintain the heat of the envelope? Even without doing the math, I'm skeptical.<br></div><div><br> Before you build this thing - consider that there has to be some kind of law against flying canisters of petrochemicals around, particularly near airports. Or not? I leave this as a legal research exercise for the reader.<br></div><div><br></div><div> -Jason Cobill<br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Mar 18, 2015 at 12:24 PM, Darcy Whyte <span dir="ltr"><<a href="mailto:darcy@inventorartist.com" target="_blank">darcy@inventorartist.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I love all the new movement towards quad copters and stuff.<div><br></div><div>They need quite a bit more energy than fixed wing so I've been thinking about buoyancy. Then there's the helium/hydrogen problem.</div><div><br></div><div>Has anybody entertained using hot air? I wonder if the hot air came from electricity it would be better or worse than a quad... Perhaps a closed container...</div><div><br></div><div>My intuition says it's worse but it's a thought...</div><div><div><div dir="ltr"><br><div><div><br></div><div><div>--</div><div>Darcy Whyte</div><div><br></div><div>Art+ <a href="http://inventorartist.com/" target="_blank">inventorArtist.com</a> | Aviation <a href="http://rubber-power.com/" target="_blank">rubber-power.com</a></div><div>Contact: <a href="mailto:darcy@inventorArtist.com" target="_blank">darcy@inventorArtist.com</a> | <a href="tel:613-563-3634" value="+16135633634" target="_blank">613-563-3634</a> by appointment (no text)</div></div></div><div><br></div></div></div></div>
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